Ball mill



May 24, 1932. J. J. D'ESCHIAMPS 1, 9,

' I BALL MILL I I ild A ril 14, 1950 2 Sheets-Sheet 1 Dachau-ups Amer: 11 IQ May 24, 1932.

J. J. DESCHAMPS BALL MILL Filed April 14, 1930 2 Sheets-Sheet '2 I Patented May 24, 1932 UNITED STATES v PATENT OFFICE JlTLES JEAN DESCHAHPS, OF PARIS, FRANCE, ASSIGNOR TO SOGIETE FRANCAISE DE) CONSTRUCTIONS IECANIQUES ANCIENS E TA BLISSEMENTS GAIL, OF DEHVAIN, NORD,

FRANCE BALL mtr.

Application filed April 14, 1930, Serial at. 444,119, and in France April 24, 1929.

This invention relates to a ball mill or crusher for pulverizing materials such as coal, cement, fertilizers, etc. of the type in which a current of air oranother gaseous fluid carries along the pulverized material towards an outlet orifice placed above the balls. The present mill is characterized by the whole of the air or gas being introduced into the lower portion of the pile of balls, thereby carrying along the pulverized material out of the latter and preventing it from:

remaining between the balls. The material to be pulverized is also-introduced together with the air or gas into the lower portion of the mill where the kinetic energy of the balls is the greatest and their crushing action most.

powerful. In a preferred form of the mill, one side wall of the rotary drum in which the 'balls are placed bears a conical casing di-' vided by air-tight partitions into a plurality of independent sectors each of which communicates directly at its periphery with theinside of the-drum and communlcates at its center, when said sector is at the lower portion of its travel, with the orifice of the intake conduit of the material to be pulverized. Other features and objects of the invention will appear in the description hereafter reference being had to the accompanying drawings wherein: p

Figure 1 is a vertical section along line 11 of Figure 2; 1 a

Figure 2 shows in its upper half a vertical section along line 22 of Figure 1, in the left hand side ofits lower half anelevation of one quarter of the conical box, and in the right hand side of its lower half a similar view when the said box is removed;

Figure 3 is a partial section similar-to that of Figure 1, showing a modified form of the outlet of the pulverized material.

In the embodiment shown in Figures 1 an 2, the'mill orcrusher comprises a.cylindrical drum 1 formed b key-shaped members 2, 2a, 26, (Figure 2) separated b wedge members 3, the whole set being held by metal hoops 4 for instance. Preferably the wedges 3 are lower in radial height than the ke s 2 so as to form longitudinal grooves 5. The drum thus constituted within which the balls 6 of different diameters are placed, is closed by two side walls or cheeks 7, 8. Fixed to the right hand wall 8 is a bushing 9 carried by the bearing 10 which rests on the bed frame or'pedestal 11. v

The left hand wall 7 carries radial angle irons 12, 13 and metal sheets 14 forming a of the drum. The sectors 18 are limited near their center by a tube or duct 20 separatin them from one another. Said tube locate in the axis of the bushing 15 connects the mill to the piping (not shown) that leads the material to the mill. It is bent at-21 so as to open downwards at 22. Thus, as the drum rotates, each sector 18 will pass before the opening 22 when it is in the low position of its travel. The opening 22 will be preferably of suflicient length to register with the opening 30 of two or three sectors 18. v

Within the right hand bushing 9 is located a tube or duct 23 connecting the inside of the 1 mill with the outlet piping for the pulverized material (not shown). Preferably blades 24 forming a grating are provided in the out-let orifice aperture 24asoas to prevent the outflow of particles not yet pulverized.

The device comprises also operating members of any known arrangement. The drum 1 may be provided for instance with a toothed crown 25 meshing with a pinion 26, and rollers 27 (the position of which may be controlled in height by any known means, (not; shown) support the drum and release the centering bushings 9, 15,

The operation of this mill is as follows:

The material to be pulverized and the gas carrying it'arrive by the tube 20, being blown by a fan placed before the drum .1 or aspired by a fan placed after the latter (not shown).

fected at the lower portion of the Owing to the opening 22 only the sectors 18 at a low position communicate with the intake duct 20, so that the introduction of the material to be pulverized into the mill is efset of balls, which facilitates considerable crushing. In some of the known ball mills the whole'of the air is not introduced at the lower part of the drum so that a portion of said air is not utilized to carry oif the pulverized material. In said mills also the material to be pulverized is introduced through the center of the drum so that a portion of the material tends to remain near the axis of the drum and is not submitted to the intense crushing action which which is produced in the device according to the present application owing to the introduction of the material at the lower part of the drum.

The longitudinal grfioves 5 allow air to pass between thekeys 2 and alsothe pulverized material which they throw back into the mill when they reach the upper portion 6' their travel owing to the rotation of the m l. The air passing between the balls es ca es through the aperture 240 and carries along the finest parts of the pulverized material.

The outlet aperture 24a. will be preferably arranged in such a manner that the powder carried along which may not be fine enough will fall back into the mill. pose various arran ements for the outlet of the gas and pulverlzed material may be contrived, such as for instance an arrangement of sectors similar to those employed for the intake. Or as shown in Figure 3, the side wall 8 may be provided with an annular aperture 24a having conical side walls. The upper portion of said aperture registers with a tube 23a carried by a plate 29 and is provided outwardly with blades 24 forming a grating which is carried by a plate 28 attached to the side wall 8 and carrying the trunnion 9a. The arrangement of the devicemay ried without departing from the scope ofthe invention as and claims.

What I claim is 1. In a ball mill having a rotary drum containing crushing balls, a side wall at the intake end of the drum provided with apertures at the periphery thereof, anintake duct for the gaseous fluid and material to be pulverized, means attached to said drum for drum,

For this purdefined in the specification placed before said wall for the gaseous fluid and material to be crushed, a casing attached sponding each with an aperture in said side wall and adapted to register successively with to said wall and divided into passages correcontaining pulverized l5 3. In a ball mill having a rotary drum conta'ining crushing balls, means for introducing the material to be pulverized together with gaseous fluid into the lower portion of the a side wall at the inlet end of-the drum rovided with apertures at its periphery, an

inlet duct for the fluid and pulverized material having walls inclined on the airis of the drum and having an opening above said axis adapted to register successivel with the apertures in the said side wall uring rotation of the drum.

In testimony whereof I aflix m signature.

JULES JEAN DESC AMPS.

be vaguiding the fluid and material from said v tures at the periphery thereof, an intake duct M. .ml. 

